tag:blogger.com,1999:blog-6578979601685683195.post7560092674025943294..comments2024-03-01T08:05:47.511+01:00Comments on PA1B's QRPp Blog: Спутник передатчик in SPRATBert, PA1Bhttp://www.blogger.com/profile/14064917598289627232noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6578979601685683195.post-48870452163246161522011-10-03T17:20:52.473+02:002011-10-03T17:20:52.473+02:00Hi Bert,
I used a couple of transistors to switch...Hi Bert,<br /><br />I used a couple of transistors to switch the anode and screen voltage but a small relay would also do the trick. My circuit also switches on the oscillator supply continuously, for as long as I transmit (in order to reduce keying chirp). But if you are in a pinch for time just key the oscillator along with the PA. <br /><br />Please remember that you can use a string of eight 9v transistor radio batteries in series for your high-voltage supply. Since the PA only draws ~14mA on key-down, the batteries should easily last for the entire event. Also, if you use batteries it's simple to tap the series string at six batteries in order to drive your oscillator with ~54Vdc.<br /><br />Good luck, Bert. I'll be listening for you, OM!<br /><br />73/72,<br />Mike, AA1TJMichael, AA1TJhttps://www.blogger.com/profile/11538000826572081873noreply@blogger.comtag:blogger.com,1999:blog-6578979601685683195.post-56334659648881228492011-09-29T22:33:30.409+02:002011-09-29T22:33:30.409+02:00Hello Michael, All parts of the transmitter are co...Hello Michael, All parts of the transmitter are connected. Now I must make a power suply for 70V and 1.2V before I can test. <br />How do make the T/R switch? <br />Hope to be ready for tuesday. 73, BertBert, PA1Bhttps://www.blogger.com/profile/14064917598289627232noreply@blogger.comtag:blogger.com,1999:blog-6578979601685683195.post-5016323562139514342011-09-29T22:27:56.574+02:002011-09-29T22:27:56.574+02:00Hallo Tjeerd, Ik de het nog even rustig aan. Ik be...Hallo Tjeerd, Ik de het nog even rustig aan. Ik ben nog niet helemaal de oude. 73, BertBert, PA1Bhttps://www.blogger.com/profile/14064917598289627232noreply@blogger.comtag:blogger.com,1999:blog-6578979601685683195.post-71402739469947448712011-09-29T16:09:39.999+02:002011-09-29T16:09:39.999+02:00Thanks for the update, Bert!
I finished my 3-tran...Thanks for the update, Bert!<br /><br />I finished my 3-transistor 15m receiver yesterday. Today I'll build the R/T and keying circuit. <br /><br />I look forward to working you, Bert. Good luck, OM!<br /><br />Beep, beep,<br />Mike, AA1TJMichael, AA1TJhttps://www.blogger.com/profile/11538000826572081873noreply@blogger.comtag:blogger.com,1999:blog-6578979601685683195.post-3636975330076803832011-09-29T09:50:31.159+02:002011-09-29T09:50:31.159+02:00Bert,
Rustig aan met de hoge spanningen. Je hebt ...Bert,<br /><br />Rustig aan met de hoge spanningen. Je hebt nog een week, naast je werk.<br /><br />73, TjeerdTjeerd, PA3GNZhttps://www.blogger.com/profile/00847742398647158779noreply@blogger.com